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Seoul shares end lower, snapping 5-day winning streak

Created at 18 Aug · 6:56 AM1 source↑ Market-relevant
IN SHORT

Seoul shares closed lower on Tuesday, ending a five-day winning streak. Investors engaged in profit-taking on large-cap stocks as hopes for a deal to end the conflict between Iran and the United States diminished.

Key Numbers

5-daywinning streak snapped
1.55 percentKOSPI decline
6,869.83KOSPI closing level
399.04 millionshares traded
29.64 trillion wonvalue of shares traded
US$20.9 billionvalue of shares traded in USD
679declining stocks
195advancing stocks
784.9 billion wonnet institutional sales
91.4 billion wonnet foreign purchases
731.29 billion wonnet retail purchases
0.51 percentDow Jones Industrial Average decline
0.32 percentNasdaq composite decline

Who's Involved

Choi Kyong-ae
Yonhap News reporter
Donald Trump
U.S. President
Seoul shares end lower, snapping 5-day winning streak

↳ Why This Matters

The decline in Seoul shares signals investor caution amid geopolitical uncertainty and inflation concerns, potentially impacting regional market sentiment and foreign investment flows.

Key facts

  • Seoul shares closed lower on Tuesday, ending a five-day winning streak.
  • The decline was attributed to profit-taking on large-cap stocks.
  • Fading hopes for a deal to end the conflict between Iran and the United States contributed to the downturn.
  • The KOSPI index fell 1.55% to 6,869.83.
  • Institutions were net sellers of stocks, while foreigners and retail investors were net buyers.

Seoul shares concluded trading lower on Tuesday, breaking a five-day rally as investors took profits from major stocks. This downturn was influenced by diminishing expectations for a resolution to the conflict between Iran and the United States. The Korean won, however, strengthened against the U.S. dollar.

The benchmark Korea Composite Stock Price Index (KOSPI) opened 2 percent higher but ultimately fell 108.11 points, or 1.55 percent, to settle at 6,869.83. Trading volume was moderate, with 399.04 million shares changing hands for a total value of 29.64 trillion won (US$20.9 billion). The number of declining stocks significantly outnumbered advancing ones, with 679 issues falling and 195 rising.

Institutional investors were net sellers, offloading stocks worth a net 784.9 billion won. Conversely, foreign and retail investors were net buyers, acquiring stocks valued at 91.4 billion won and 731.29 billion won, respectively.

Overnight, U.S. markets saw declines, with the Dow Jones Industrial Average shedding 0.51 percent and the tech-heavy Nasdaq composite falling 0.32 percent. Elevated oil prices continued to fuel inflation concerns. Hopes for a diplomatic agreement with Iran waned after U.S. President Donald Trump indicated he was not interested in extending an existing agreement with Iran.

Frequently asked questions

Seoul shares fell due to profit-taking on large-cap stocks and fading hopes for a deal to end the conflict between Iran and the United States, which also stoked inflation concerns.

The benchmark Korea Composite Stock Price Index (KOSPI) fell 108.11 points, or 1.55 percent, to close at 6,869.83.

Institutions sold a net 784.9 billion won worth of stocks, while foreigners and retail investors bought a net 91.4 billion won and 731.29 billion won, respectively.

Overnight, the Dow Jones Industrial Average shed 0.51 percent, and the tech-heavy Nasdaq composite declined 0.32 percent.

What Happens Next

01Monitor further developments in the Iran-U.S. relations.
02Observe upcoming inflation data and central bank policy responses.
03Track institutional and foreign investor flows in the Korean market.
CME Headlines
  • SPAN 2 Framework Equity Model Parameter Changes - Effective August 18, 2026
    17 Aug · 8:45 PM
  • S&P 500 futures drift lower ahead of market expiration week.
    17 Aug · 7:55 PM
  • S&P 500 futures drift lower ahead of market expiration week.
    17 Aug · 7:55 PM

How It Developed

Seoul shares ended lower on Tuesday, snapping a five-day winning streak.
Investors locked in profits on large-cap stocks.
Hopes for a deal to end the war between Iran and the United States faded.
The benchmark Korea Composite Stock Price Index (KOSPI) fell 108.11 points, or 1.55 percent, to close at 6,869.83.
Institutions sold a net 784.9 billion won worth of stocks.
Foreigners and retail investors bought a net 91.4 billion won and 731.29 billion won, respectively.
The Dow Jones Industrial Average shed 0.51 percent, and the Nasdaq composite declined 0.32 percent overnight.
Oil prices remained elevated, stoking inflation concerns.

Sources

T1
Seoul shares end lower, snapping 5-day winning streak, on profit-takingYonhap News Agency

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